Shoe Shine in London

I am going to be working in London for the next few months.
Where can one get a decent shoe shine in the City? I work near Bank station.
My google and forum searches did not yield a definitive answer on the subject.

Justin Fitzpatrick (blogs at the Shoe Snob) is excellent. He's now at Gieves and Hawkes Savile Row in the morning and Selfridges in the afternoon. Shine from £5 for a basic iirc up to £20 for the full military parade shine.